Man seen dropping bag is focus of Boston bombing investigation

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FILE - In this Monday, April 15, 2013 file photo, Investigators shine flashlights at one of the blast sites on Boylston Street near the finish line of the 2013 Boston Marathon in the wake of two blasts in Boston. Many of Boston's shops and outdoor cafes are beginning to re-open. But there are signs everywhere that a return to normalcy will take time for the thousands of people who live and work near the site of Monday's marathon bombings. (AP Photo/Elise Amendola, File)